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79 lines
1.9 KiB
Rust
79 lines
1.9 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::context::CommandRegistry;
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use crate::prelude::*;
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use nu_errors::ShellError;
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use nu_protocol::{ReturnSuccess, Signature, SyntaxShape, UntaggedValue, Value};
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#[derive(Deserialize)]
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struct AppendArgs {
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row: Value,
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}
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pub struct Append;
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impl WholeStreamCommand for Append {
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fn name(&self) -> &str {
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"append"
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}
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fn signature(&self) -> Signature {
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Signature::build("append").required(
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"row value",
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SyntaxShape::Any,
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"the value of the row to append to the table",
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)
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}
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fn usage(&self) -> &str {
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"Append the given row to the table"
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}
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fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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append(args, registry)
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Add something to the end of a list or table",
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example: "echo [1 2 3] | append 4",
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result: Some(vec![
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UntaggedValue::int(1).into(),
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UntaggedValue::int(2).into(),
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UntaggedValue::int(3).into(),
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UntaggedValue::int(4).into(),
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]),
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}]
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}
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}
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fn append(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let registry = registry.clone();
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let stream = async_stream! {
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let (AppendArgs { row }, mut input) = args.process(®istry).await?;
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while let Some(item) = input.next().await {
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yield ReturnSuccess::value(item);
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}
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yield ReturnSuccess::value(row);
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};
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Ok(stream.to_output_stream())
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}
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#[cfg(test)]
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mod tests {
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use super::Append;
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#[test]
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fn examples_work_as_expected() {
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use crate::examples::test as test_examples;
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test_examples(Append {})
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}
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}
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